package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

//    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
//        this.stringRedisTemplate = stringRedisTemplate;
//    }

    //开始时间戳
    private static final long BEGIN_TIMESTAMP = 1735689600L;
    //序列号的位数
    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix){
        //1、生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2、生成序列号
        //2.1、获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2、自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3、拼接并返回
        return timestamp << COUNT_BITS | count;
    }

//    public static void main(String[] args) {
//        LocalDateTime time = LocalDateTime.of(2025,1,1,0,0,0);
//        long second = time.toEpochSecond(ZoneOffset.UTC);
//        System.out.println("2025年1月1日时间戳= " + second);
//    }
}
